Made 'check_environ()' "public" by stripping the leading underscore; added a global '_environ_checked' so we know if it's already been called.
Made 'check_environ()' "public" by stripping the leading underscore;
added a global '_environ_checked' so we know if it's already been
called.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator